Operator&#39;s position circuit



Oct. 14, 1941. J. F. DAHL OPERATOR'S POSITION CIRCUIT Filed May l5, 1940 3 Sheets-Sheet l m murio www.

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A {rom/EY Oct. 14, 1941. 1 F DAHL v 2,259,100

OPERATORS POSITION CIRCUIT Filed May l15, 1940 3 Sheets-Sheet 2 v f POS/T/UN REG/STER COUNT CIRCUIT /NVE/v TOR J F. DAHL A 7' TORNEI Oct. 14, 1941. J. F. DAHL 2,259,100

OPERATOR' S POS ITION CIRCUIT Filed May 15,'1940 3 shets-sheet 3 CALLS WA /T/NG C /RCU/T CALLS WAIT/NG C /RCU/ T OFF/CE C @fig ATTORNEV Patented Oct. 14, 1941 OPER-Arrows POSITION CIRCUIT Jack vIahl, Millb'urnN. J., essignor' tolell Ijelephone Laboratories,

Incorporated; New

York, N. Y., a corporation of New York Application May 15, 1940, Serial No. 335,245

(CL 17g-'27 )v 8 Claims.

This invention relates to telephone systems and has for its object to' facilitate the handling of calls requiring the services of an operator.

In certain exchange areas it has proved convenient to terminate the lines of a plurality of dices in one building and to inake the control equipment common to the ofces. In such an installation there will bev groups of junctors incoming individually to each ollice and, where convenient, groups of junctois incoming to a plurality of ocs. Such groups of junctors establish an indication of the oice to which they are connected in the common control equipment'.

Calls incoming from a manu'alcperators position' are directed to a B operators position and, in accordance with the present invention, where the incoming trunks or junctors have access to more than one oice, means is provided to inforni the calling operator that the oiiice designation is required. The B operator is also provided with means for 'indicating to the sender to' which of the oces the call is to be' directed.

More specifically, during the connection of the incoming junctor and the terminating sende'r, a group circuit iii the link control circuit sets up an indication which' shows whether the calling junc'toi` has access to one or more than one oce and, in the former case, gives the identity of the olcce. l.Ifo the junctor serves a plurality of oiiices, this information modies the operation ofthe tonef generation at the operators position to inform the loriginating operator that the oice identity should be given. The B operator receiving this ifnformation gives a discriminating indication to the sender to' control the marker to make selections inthe proper o'iiice.

, Where there are large groups of incoming trunks, the groups may be served by individual groups oi senders which haye access to the operators positions common.V In such a case, means is provided to render an operators position unavailable to one group of senders when desired. l Means is` alsoprovided to give a rel ordern signal to any senderof that group which may have just seized the position. o 4'Ihese and other features of the invention will loecmore apparent from a consideration of the following descrip-tion in connection with the drawings, in which:

Fig. 1 shows, in skeletonized form, calling lines, A operators cord circuits, three incoming junctors and a sender;

Fig. 2 shows a B operators position circuit;

` Fig. 3 shows a second incoming connection and the position groupingcircuit; and

Figs. 4 and 5 show alternative methods of arranging the other igures. y

The sender and position circuit of Figs,` 1 and 2 formparts of uthe disclosure of the copending application of R. C. Davis et al.,- `Serial No. 335,240, iiled May 15, 1940, to which reference is made for a complete-description of the sender. In general, the reference numerals used in- Figs; 1 and 2 of the presentapplication are the same as those of the copending application. Y Referring Yfirst to the arrangement of Fig. 4 in this disclosure, three junctors I 0I H12 vand |03 are shown,junctor IUI terminating in ofce A, junctor |02 in oce B and junctor Ill3 in both oices. When an AA operator seizes one oi these junctors, the incoming link control circuit (not shown) connects the junctor with the terminating end of a sender; In the control circuit a group relay, such as relay H3, |20,- etc., is operated to ground one of conductors H5, IIB or II'I and operate a relay in the sender indicative of the oce at which the'junctor terminates.

' Relay 208'is operated when the junctor terminates at office A, relay 2I2 for olice B. and relay 2II for junctors which are common to both oflices.

'I'he B sender is divi-ded into two sections connected together by two pairs of conductors, namely, a talking circuit and a fundamental circuit.v One section is located at a centralized office and has a position finder 300 by means of which it has access to the B operators position of Fig, 2. The centralized sender also has a set of registers ,which are positioned under the control of the B operator. The other section is located at the terminating chica-receives the designation from the centralized sender and controls a marker which in turn controls the establishment of the wanted connection.

Assuming first that a call is originated-over junctor IUI for a subscriber at office A, relay I I3 will be operated. When the sender has been seized, relay 208 is operated and the circuits connecting the terminating sender tothe centralized sender are established. The circuit over the talking conductors extends from battery through the leftl winding of -relay SI2, outer back contact of relay 9| I, lower left Winding of repeating coil 9I0, conductor 228, lower right winding of repeating coil 226, through the Winding of relay `225, upper right winding of coil 226, conductor 221, upper left winding of coil 9I0,

inner back contact of relay 9| I to ground through the right winding of relay 9 I 2. The fundamental circuit extends from battery through the winding of relay 3|0, inner back contact of relay 2| conductor 232, lower back contact of relay |000, winding of relay |002, upper back contact of relay |000, conductor 233, outer back contact of relay 2|| to ground through the winding of relay 5|4. This latter circuit is ineffective at this time. The operation of relay 9|2 starts the position finder 900 hunting for an idle B operators position.

When a position such as the position of Fig. 2 is occupied, the insertion of the plug of the operators headset 605 in the position jack 606 closes a circuit from battery through the right winding of relay 604, through the plug and jack connection and the transmitter of the headset to ground through the left winding of relay 604. Relay 604 operates, connecting battery over its inner left contact, conductor 6|2, left normal contact of key 603, left back contact of relay 602, resistance 60| to conductor 600, which is connected to one of the terminals engaged by position finder brush 906.

As soon as the position is found, the position finder is brought to rest and battery through a relay is connected to conductor 922 for operating relay 60B. Relay 608 closes a circuit from battery over the inner left front contact of relay 604, conductor 6 I 2, contact of relay 608 through lamp 609 to ground through interrupter 6|0 to warn the operator that her position has been seized. In the sender a relay, operated as a result of finding the position, connects the outer ends of the right windings of repeating coil 9|0, over brushes 90| and 902 and conductors 921 and 928 to the position circuit. The inner end of the upper right winding of coil 9I0 is connected through the upper windings of polarized relays 924 and 925 to battery while the inner end of the lower right winding of coil 9|0 is connected through the lower windings of relays 924 and 925 to ground.

In the position circuit conductor 921 is connected through the windings of relay 6|| to conductor 928. Therefore, relay 6I| operates and at its right contact extends conductor 928 over the outer right back contact of relay 6|3 to the secondary winding of tone coil 6|4. Conductor 921 is connected through condenser 6|5 over the outer left back contact of relay 6|3 to the other side of the secondary winding of tone coil 6|4. Relay 6|I at its left contact closes a circuit from battery on conductor 6|2 to the winding of relay 629 and ground. Relay 629 operates and closes a circuit from tone source 6|6, outer right front contact of relay 629, left back contact of relay 6|1, right back contact of relay 6|8, primary winding of tone coil 6|4 to ground at the inner right back contact of relay 6|3, thereby transmitting a tone over the conductors 921 and 928, brushes 90| and 902, through repeating coil 9|0, conductors 221 and 228, through repeating coil 226, and thence to the position of the A operator. The B operator may also hear the tone transmitted to her headset receiver through condensers 620 and 62|.

Relay 629 also closes an obvious circuit for relay 601 and completes a circuit for relay 6|9 which may be traced from battery through the winding of relay 6|9, right back contact of relay 6| 1, conductor 622, outer left contact of relay 629, to ground at the outer right front contact of relay 604. Relay 601 disconnects conductor V922 from the Winding of relay 608 permitting relay 608 to release and disconnect battery from lamp 609. With relays 629 and 601 operated a circuit is closed from battery through the Winding of relay 6|8, right front contact of relay 601, inner left back contact of relay 6|3, to grounded conductor 622. Relay 6|8 is slow to operate and, after an interval, opens the circuit through the primary winding of tone coil 6|4, thereby interrupting the tone. Relay 6|8 closes a circuit from battery through the left winding of relay 602, left front contact of relay 6|8 to ground on conductor 622. Relay 602 locks through its right winding and inner right front contact to ground at the inner left contact of relay 629 and extends its operating ground to the winding of relay 623. In addition, relay 602 reconnects battery to lamp 609 over the outer left front contact of relay 602, left normal contact of key 603 and conductor SI2. Relay 623 operates and recloses the primary circuit of tone coil 6|4 which now extends over the right front contact of relay1 6|8 and the outer left front con tact of relay 623 instead of over the back contact of relay 6|8. A second tone is, therefore, transmitted to the A operator. Relay 623 also closes a circuit from ground on conductor 622, inner contact of relay 623 to the Winding of relay 6|1 and battery. Relay 6|1 is also slow to operate and after an interval again opens the primary circuit of the tone coil to interrupt the second impulse of tone. In addition, relay 6|1 closes a circuit from ground on conductor 622, right front contact of relay 6|1, left back contact of relay 624 to the winding of relay 6|3 and battery. Relay 6|3 locks over its left alternate contact to ground on conductor 622, short-circuits condensers 620 and 62| and connects ground over its right alternate contacts to lamp 609 in shunt of interrupter 6|0 whereby lamp 609 glows steadily to inform the operator that her headset has been connected to the A operators position.

The A operator then passes the wanted number to the B operator and the B operator operates the keys of her key-set to record the number given.

When the number has been recorded, relay |000 is operated to substitute stepping relay |004 for polarized relay |002 and to prepare for the transfer of the designation to the terminating sender.

When a call comes in over a junctor |02 leading to oince B, relay 2|2 operates, which gives a diierent indication to the marker but does not affect the operation of the position circuit.

When a call comes in over junctor |03 leading to both offices, relay 2|| is operated. With relay 2|| operated the connection of battery and ground to the fundamental circuit is reversed and relay |002 in the centralized sender operates, in turn operating relay |003. Relay |603 reverses the connection of stepping relay |004 to the contacts of relay |000 to compensate for the reversal by relay 2|I. Relay |003 also connects ground over its middle lower front contact,` brush 904, conductor 930, right back contact of relay 602 to the left winding of relay 624 and battery. Relay 624 locks in a circuit from battery through its right winding and inner right front contact to ground at the inner left front contact of relay 629 and completes the circuit of lamp 655 to indicate that the incoming call requires an office indication.

When relay 629 operates, the primary circuit of the tone coil extends from source 6|6, outer right front contact of relay 629, left back contact of natale@ relay Ell, outer right front contact of relaygll,

primary winding f coil 6|4 to ground attire inl nerright back contact of. relay 613. As before,

seyne @pleisters was ele; nl sin en, stille r'eley dit bnttlile tene eireliit .is Vlield clp ed over the ,contacts of relays .62,4 and .619

sheer er the eenraee'errelsy els'. neer sie t hich in turn lcymperates 'relay 3 l n,erates relay 6|`| which opens .reley'ltf Relsy-tlllreleeses leiter en enrl'enens tne eirenit er tne tene tenslneednef- With releytil2 en. ted? .terreeeiyes ine .enlee neme, elle energies. .ene el tile lreys 6.5..' er 6.5.2 .e 9rd* inetd ,tile .identity yef the vviii/ernten efnee- Key del., snrresrendine te einde A., eenneets. battery over conductor 6|2 through v resistance ,65.3, tnreneh the tWe windings ef reley t!! i. nersllel te .edndneters .921 .end 9.2@ illness eend-neters ere eenneeted nrerienslytreeedtnrellsli the windings nelerineel relays .92d and .92d Wltll bettery'eenneeted te eendneters 9?? .and ,9233, reley 9.2.5 "eperetes, elesine .e .ensuit frein erennd eri-esndneter lltlll.Y eentset .er Vrelay 9.25.! unser bask .Contact .ef relay lill to the Winding .ef reley id21. end battery: Relay es? in eneretlns leelrs ever its lower ,trent eenteet through the Win ne ef ,relay .94.' .te srnllnd- Y*Wlitflf .relaysIllilltener-v ered, reley .lllril nennst ererete until the .eines registration nes been Inside, sinne tile .eirenlt ef relay ll dit new entends. frein battery .ter-.nnen the Winding er tnet relay, enter. lewe-.r .firent sentent eliv relay lilly, dieser lr-.ent .sentant ef relay .$.42 sind the linger neel; sentent si reley lill te gr und over conductor ey 52corresponding to oiflice B, is opeI-, ated it connects ground to conductors S21-and stesa. ingof rel 579.4! and closes the ,operating circuit fdr `reley`lelllll "in 'edditienf dnne inegi-line group `se'lectio'r.- theco'unting rrelay circuit is modified by the loperation of relay 941]'. The

9,25. and relety 92d. bretelles! .in turn enere'tins're-i l vRelay. 9&9 also locks through the wind-v pulsing circuitextends from the contact of stepping relay |994 through the thousands and hundreds registers to the counting relays which operate successively until the No. 1 counting relay has been operated. With relay 949 normal the circuit is extended over the lower back contact of relay 9M) to the No. `0 counting relay IUIU which locks through relays |020 and |027, the latter relays terminating the pulsing. With relay 920 operated the counting circuit extends over the front contact of relay 9136 to the winding of the No. 6 counting relay HHS. As shown in detail in the Davis et al. application, this causes ve additional pulses to be transmitted, in turn causing the sender to transmit to the marker an indication which in combination with that set up by relay 2| tells the marker to select the line in oice B.

If the position does not function properly, the operator may operate key 683, connecting ground over the inner right operated contact of key 603, outer right front contact of relay 6|3, through the right front contact of relay 6| I to conductor 928 and through the windings of relay 6|| to conductor 921, operating relay 924 as when key f with the anderer the .6.5.2 yles epereted- .If .en nlliee ,registration .hes bcen'made, so thatrelay 94| is operated, the eneretien el .re-.ley .9.24 completes-e `eirenltfer teiliger felt-lt .9i-l vWills-ill eentrels .tile transmission di 'reerder signel xdeserlleed in the Devis et aletnnliestien- Referer noyy to the arrangernerltof Fig. .5, .Fia 3 is .inserted between Figs. 1 .end .2 This arrangement Afinds lise yrllere ene .set of B enieref ters es mere tnfenene' instelletien; .one ef linie. des'. a sinelesllse'serred ley' senders @grinned .er reelelrinsenly tne nnnierieel desisnatioh and another which includes two r,offices served by common senders .which mayv receive eniee lndleetien Under neeyy trente eend-t' 'ieiiciencyis promoted by setting aside certain operators to handle" the calls from the single ofl'ice installation.

For such an arrangement, the equipment yof Fig. A3 Nis provided at each op erator"s` position.

circuits pf Fig. 3 normal, the test conductor B and the talking conductors 928 and 921 are .extended in parallel overY the back contfttsl .-f lltllty '35.5 ti? lelzmllls il? lil-le barril@ 0f leeelsf-.senfteets er relay .elle te Aelen- .tfletsr .er lriislies 3.06, lil .end er? er4 nesitien finden .dell eisseeieted livith the single nneennit C! Thereforeftlie operxatorfs position' of 2 is norf lnelly eeeessilllete 'ell nesitien lfinders- .In -tliis .ine.,.iled arrangement .there ere sells waiting signal circuits 32| d l3,22 associated e of the single circuit 651, esnneetedteeendneterits ley releyV ted te .eendlieter ensietine ree ll! in eelnlel-netien with .relays die es .eirenlts .in lne siegel eirenits 3:25' indleete .filet the position is deednied end is seryinsnetn units in" edditien. Yrelay .e .ls supplies ground tothemouter. left armature of n ii relay 6.21.9., While tile endend rsrlnerly .eflese'd te that .ernietllre .is estende-d .ray-.er eendneter' .32s, tlnrd lllpner beek entee't ,of relay' .3l Winding ef relay .3'.3 .end battery lisier tl 3 .in .tern 'eseretes .relay elli'.- Y`

th `the ci cuits in this condition, the func- 1 ng ofthe position is as described. Ifitis desired te .lin'nl ine sells .lnedrnine te tnis nesitlen te tlldse .freni unit C, key Sill will be e11- egrated, closing a circuit from "ground over the lowerl front contact of relayv 3|8, contacts of key 3| 9, winding of relay 3|5 and battery. Relay 3|5 disconnects the position circuit from the banks associated with brushes 90|, 902 and 906 and' from ythe banks of other nders of the corresponding unit. It opens the circuit to the signal circuit 32| and closes an additional circuit to signal circuit 322 to indicate that the position is now serving only unit C. It also disconnects lamp 3H from signal circuit 32|.

At its third upper armature, relay 3|5 closes a circuit from brush 90|, through resistance 325, upper front contact of relay 3|3, upper front contact of relay 3| 5, to ground over conductor 324. It also opens the circuit of relay 3|3 which releases slowly, followed by relay 3M which also releases slowly. When relay 3|3 releases, it opens the above-traced circuit but when relay 3M releases the circuit is reclosed over the back contacts of relays 3|4 and 3|3. If one of the position finders, such as finder 99D, had just selected this position at the time key 3|9 was operated, the circuit would extend through the upper windings of relays 925 and 924, causing the successive operation of relays 94| and 9|`| to transmit a reorder signal to the originating operator.

If this position is to serve only calls in the double cnice unit, key 32B is operated, operating relay 3|6. Relay 316 disconnects the position from position finder 300, rearranges the circuits of the signal circuits and connects ground through resistance 326 to brush 30| to transmit a reorder signal to any finder of that group which may have just attempted to seize the position. Since the senders of unit C do not receive an office indication, the double ground pulse is not necessary.

What is claimed is:

1. In a telephone system, trunks terminating at a single office, trunks terminating at a plurality of oflices, operators positions common to said terminating Vmilices, means to connect said positions to said' trunks, and means in said operators positions for indicating Whether a connected trunk terminates in one oilice or in a plurality of oflices.

2. In a telephone system, trunks terminating at a single oice, trunks terminating at a plurality of oiiices, operators positions, means to interconnect said positions over one of said trunks, and means in one of said operators positions for giving an indication to the operators at both of said positions whether said trunk terminates in one oice or in a plurality of offices.

3. In a telephone system, trunks terminating at a single oiice, trunks terminating at a plurality of oflices, operators positions, means to interconnect said positions over one of said trunks, means in one of said operators positions normally effective to generate two short pulses of tone, and means in said one position operated if said positions are interconnected over a trunk terminating at a plurality of oiices to generate a single long tone pulse.

4. In a telephone system, trunks terminating at a single office, trunks terminating at a plurality of oices, operators positions, means to interconnect said positions over one of said trunks, a series of relays in one of said operators positions, means to successively operate said relays to transmit two short pulses of tone over said trunk, and means in said one position, operated if said trunk terminates at a plurality of oiiices to render ineiective certain of said series of relays in order to transmit a prolonged tone over said trunk.

5. In a telephone system, a first group of trunks terminating at a single office, a second group of trunks terminating at a plurality of ofces, operators positions, means normally effective to connect said positions to any one of said trunks, means in said operators positions for giving an indication as to Whether said trunk terminates in one office or in a plurality of ofces, and means to render one of said operators positions available only to trunks of a particular group.

6. In a telephone system, a rst group of trunks terminating at a single ofce, a second group of trunks terminating at a plurality of oices, operators positions, means normally effective to connect said positions to any one of said trunks, means in said operators positions for giving an indication as to whether said trunk terminates in one office or in a plurality of ofces, and means to prevent the connection of one of said operators positions to trunks of a particular group.

'7. In a telephone system, a rst group of trunks terminating at a single oflice, a second group of trunks terminating at a plurality of ofces, operators positions, means normally effective to connect said positions to any one of said trunks, means in said operators positions for giving an indication as to Whether said trunk terminates in one oiice or in a plurality of offices, means to render one of said operators positions available only to trunks of a particular group, and means to give a reorder signal to a connected trunk of the other group.

8. In a telephone system, a first group of trunks terminating at a single office, a second group of trunks terminating at a plurality of oices, operators positions, means normally effective to connect said positions to any one of said trunks, means in said operators positions for giving an indication as to whether said trunk terminates in one oice or in a plurality of offices, means to prevent the connection of one of said operators positions to trunks of a particular group, and means to give a reorder signal t0 a trunk of said particular group attempting a connection with said position.

JACK F. DAHL. 

